Autostop governor



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Original Filed June 9. 1920 2 Sheets-Sheet 1 u mmfi I til ran. l tuningBY ATTORNEY May 12, 1925.

J. P. R I'GSBY ET AL Original Filed June 9, 1920 2 Sheets-Sheet 2INVENTOR Jl .BigsbyficW TManning ATTORNEY Patented May 12, 1925.

UNITED STATES PATENT OFFICE.

JOHN P. RIGSIBY AND WILLIAM T. lVIANNING, OF ESSINGTON, PENNSYLVANIA,AS-

SIGNORS TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A GOR-PORATION OF PENNSYLVANIA.

AUTOSTOP GOVERNOR.

Application filed. June 9, 1920, Serial No. 387,532. Renewed February 1,1923.

To all whom it may concern:

Be it known that we, Jot-1N P.-Rresnr and WILLIAM T. MANNING, citizensof the United States, and residents of Essington, in the county ofDelaware and State of Pennsylvania, have invented a new and usefulImprovement in Autostop Governors, of whicl the following is aspecification.

Our invention relates to improvements in governing mechanism for steamturbines,

and more particularly to that class of gov'' erning mechanism employedto automactically shut off the steam supply to the turbine when apredetermined overspeed is reached.

The object of our invention is the provision ofmeans, in connection withthe centrifugal trip weight of the usual auto-stop gov ernor, wherebythe center of gravity thereof may be changed relatively to the axis ofrotation so that tripping action may be effected at a speed belownormal.

lVe attain these objectsby the mechanism illustrated in the accompanyingdrawing, in which- Fig. 1 is a sectional view through the turbine-drivenelement or cap to be mounted on the end of the turbine shaft; Fig. 2, asectional view taken along line II-II of Fig. 1; Fig. 3, a detail of thedetachable weight; Fig. 1, a modification of the tripping weight; Fig.5, a sectional view taken along line VV of Fig. 4:; Fig. 6, a secondmodification of the tripping weight; Fig. 7, a sectional view takenalong line VIIVII of Fig. 6; Fig. 8 is a detail View of the trippingweight member; and Fig. 9is a sectional view, on a smaller scale,showing an oil bath for the governing mechanism.

The overspeed governing mechanism, hereafter referred to as theauto-stop governor,

is mounted in a turbine-driven element or cap 10 having a thread 11 sothat it canbe screwed onto the end of the turbine shaft. The cap 10 isprovided with an extension 12 having a diametral recess 13 with fourshoulders 14, 15, 27 and 28, the top of the recess being threaded at 16to receive the retainer ring, collar, or abutment 17 which is providedwith a guide opening in which the weight 18 may slide. The retainerring, collar or abutment 17 holds the spring 19 in place; and, dueto thethreaded connection thereof to the recess, the tension of the spring maybe readily adjusted. The spring 1.? also bears against the flange 20 oftrips ping weight or member 18 to maintain the flange in contact withthe collar or abutment 21 when the turbine-driven element is rota t-.

ing at normal speeds. The shoulder 15 and the abutment or collar 21cooperate with the flange'20 to limit travel of the tripping or recessfor purposes hereinafter described and for the purpose of assuring thatthe center of gravity thereof shall be eccentric to the axis of rotationof the driven member so that, upon the attainment of a predeterminedoverspeed, the tripping weight moves out in responseto centrifugal forceto trip the element 22 in the usual way.

The retainer 17 is provided with a series of radial slots. 23 cut aroundthe. edge into which the detention pin 24 may project and thus hold theretainer 17 in any desired position. The leaf spring 25 is connected toone end of the pin 24 to hold the latter inplace, the spring in turnbeing held in place by means of the set screw 26.

The collar 21 tightly fits in the recess and i tripping weight 18. Thedetachable weightis held in place by means of the twopins or lugs 33carried by the weight 18 and which normally seat in recess 35 in thedetachable weight, the spring 34 in recess 32 pressing against thedetachable weight to hold the latter with the recesses seated about thepins or lugs. Y

Twoslots 36 are cut the whole length of the detachable weight 31whichpermit it to be removed. A slot 37 is provided across the face ofthe weight in order that a screw driver may be inserted to facilitateremoving. The passage 38 through the center of the weight permits theescape of-cilthat may collect; in recess 320i Weight 18.

To test the auto-stop governor the detachable weight 31- must be removedwhich causes the governor to act at below norma l-speed instead ofabove. the detachable weight 81 together with the spring 34, it issimply necessary to push the weight in until it is disengaged from pinsor lugs 33, then turn the weight 31 onequarter of a turn until the slots36, which extend the entire length of weight 31, regis- 'ter with pins.33. The spring 34 then forces the weight out to a point where it may beremoved with spring attached.

In Fig. 4, showing :a modification {of the tripping weight or member,the weight or member 40 is provided with .a recess 41 in the lower endin which is mounted a movable weight 42. In the normal running posi tionas illustrated in the drawing, the weight is held in place .by the twopins 43 mounted inthe piston 44 of the weight, and also by the collar 45pressed against the shoulder 46 and peanedfirmly in place. 'lhe movableweight 42 :is provided at its edge with two slots 47 extending theentire length of the weight which permit the weight to passabove thepins 48 and occupy the space between the pins and the bottom of therecess. The weight 42 also provided with a slot- 48 cut'aeross the facewhich Dermits a screw driver to be inserted in order to turn the weight.more .easily. The-passage 49 through thecenter of the weight permits anyoil to escape which may be collected in the recess.

In order to test the auto-stop governor, it is simply necessary toinsert a screw driver in the slot 48 .and turn the weight 42 one-quarterofa turn untilthe slots 47, e2;-

' tending the whole length of the weight 42,

register with the pins. 43. The w "ht 42 may then be moved. above thepins 40; and,

when iven a vuarter turn will be firmly, b 5

held in place between pins 43 and the bottom-of the recess 41. thusmoving-the center of gravity of the centrifugal trip weight furtherarray from theaziis of rotation, the weight 40 will trip theuelement 22.at a speed of about below normal instead vofat about 10%;overspeed.

Yfhile we have shown bayonetdike or pin and :slot. connectionsforsecuring the supplemental weight members 31 and 42 of Figs. 1 and 4,respectively, in position. itis to be understood that any suitablelocking connection may be employed so long as such weight members may bereadily locked in a single position only with respect to the trippingmember (the element 18 of Fig. 1 or the element 4.0 of Fig. Inotherwords, the lucid-n means should be capable of bolding thesupplemental weight member in a s ngle position only witlrrespect tothetrip- To remove ping member so that it may be removed when testingthe governor and-then may be replaced without the necessity foradjustment for a predetermined overspced; hen the auto-stop isinstalled, with the supplemental weight member locked' in normalposition, the tension of the spring 19 is adjusted until the trippingmember moves out at a predetermined or desired overspeed. Thereafter,the supplemental weight may be removed, when making .a test, and then itmay be readily reinserted in its'definitely locked position withoutdisturbing the original setting and, therefore,without calling forreadjustment.

In Fig. 6, there is showna further modification of the tripping weight,in which the weight 50 is provided with.arecess51thneadediits entirelength. 'lhe movable weight 52,

due to the threaded connection with the recess, can be adjustedat willto vary-the center ofgravity of the weight 50. Here again the weight isprovided with :a. slot 53 in the .face to permit the insertion-of ascrew driver to facilitate turning, and also .with a pas- Sage 54 topermit oil to escape iron: the recess 51. The collar 55 is pressed upagainst shoulder .56 and peaned into place to prevent the weight-'52from coming out. In order to hold the weight 52'firmly in any desiredposition a lock nut 57 is provided, the nut having a slot 518 to permitthe insertion of a screw driver so that it can be readily tightenedagainst the movable weight 52.

In order to-test the auto-stop governor it is simply necessary to loosenthe lock nut 57, screw the movable weight :52 in until it occupies thebottom of the recess '51, and then screw lock nut against it to hold itfirmly in place. By thus moving the center ofgravity of the centrifugal"trip element further .away from theuaxis oi rotation, the weight willtrip the element 22 at a speed of about 5% below normal instead of atabout 10% overspeed.

- As may be seen from F 8, the tripping weight member, in the-operationalready referred to in connection with Figs. l5, inclusive, has twocenters of gravity,namely, one (indicated at {I/l,..0'f greatereccentricity with respect to the axis oi rotation (indicated by the line(cb") of therotary member 10 when thesupplemental weightmeu1- ber 31 isdetached for testing purpo, s the other (indicated at m), a center oi kI ity of smaller eccentricity when the supplemental weight is inposition. It will, there fore, be seen that we have provided means whiehrenders the tripping weight ofa governor of the character referred toreadily susceptible of being tested withoutinany way disturbing thenormaloperative adjustment.

ion

Consequently, our improved governor may be readily and easily testedwith .a min-innim of effort on the part of the operator.

"While we have shown our invention in a plurality of forms, it will beobvious to those skilled in the art that it is not so limited, butisisusceptible of various other changes and modifications, withoutdeparting from the spirit thereof, and we desire, therefore, that onlysuch limitations shall be placed thereupon as are imposed by the priorart or as are specifically set forth in the appended claims.

What we claim is 1- 1. In an auto-stop governing mechanism for rotarymechanism, the combination of a transversely movable tripping member, adetachable weight member, and releasable locking means for holding thedetachable weight member in a single position only with respect to thetrippingniember, whereby, when the detachable weight member is locked inposition the tripping member moves out to tripping position upon theattainment of a predetermined overspeed, and, when thedetachable weightmember is removed, the tripping member moves to tripping position at aspeed below the pre determined overspeed.

2. In an auto-stopgoverning mechanism for rotary mechanism, thecombination of a transversely movable tripping member, a detachableweight member, and means cooperating with the tripping member at itsinner end to define a fixed position for and for holding the detachableweight member in that position so as to cause the tripping member torespond to a predetermined overspeed, said detachable weight memberbeing provided with means whereby it may be removed from its position tosecure tripping movement of the tripping member at a speed below saidpredetermined speed.

3. In an auto-stop governing mechanism for rotary mechanism, thecombination of a transversely movable tripping member, an

abutment carried by the tripping member, a detachable weight member, andmeans cooperating with the detachable weight member to maintain thelatter in a predetermined position in contact with the abutment torender the tripping member responsive to a predetermined overspeed, saiddetachable weight member being provided with means whereby it may beremoved to render the tripping member responsive to a speed below saidpredetermined overspeed.

4. In an auto-stop governing mechanism for rotary mechanism, thecombination of a transversely movable tripping member, a

detachable wei 'ht member, and a bayonetlike connection between thetripping memher and the detachable weight member, whereby the detachableweight member may be readily secured to and removed from a predeterminedand definite position with respect to the tripping member.

5. In an auto stop governing mechanism for rotary mechanism, thecombination of a transversely movable tripping member having a recess atits inner end, one or more inwardly projecting lugs in the recess, aweight" member having a longitudinal groove or grooves corresponding tothe lug or lugs, whereby the weight member may be inserted in the recessand turned sov as to be held by the lugs, and means cooperating with theweight member oppositely to the lug or lugs for holding it in position.

6. In an auto-stop governing mechanism for rotary mechanism, atransversely movable trip ing member comprising an elon: gated bo yportion with a flange arranged at its inner end, a spring surroundingthe elongated body portion and seating against the flange, means forvarying the tension or the spring, a detachable weight member, andlocking means arranged between the trans versely movable tripping memberand the detachable weight member, whereby the latter may be held in apredetermined and single position with respect to the tripping member torender the latter responsive to a predetermined over-speed, and,whereby, when the detachable weight member is removed, the trippingmember is rendered responsive to a speedbelow the predeterminedoverspeed.

.7. In an auto-stop governing mechanism for rotary mechanism, atransversely m0vill) able tripping member, adjustable means associatedwith the tripping member to oppose movement thereof to a trippingposition until a predetermined speed of the r0- tary member is weightmember, a pin or pinscarried by the tripping member an'dthe detachableweight member beingprovided with a recess or recesses corresponding tothe pin or pins, whereby the detachable weight member may be placed inposition by passing the slot or slots thereof over the pin or pins andthen turning it so that it rests against said pin or pins, and meanscooperating with the detachable weight member for holding it in thelatter position.

8. In an auto stop governing mechanism for rotary mechanism, atransversely move able trip ing member having its center of gravityisposed eccentrically with respect to the axis of rotation of the rotarymember and having a longitudinalrecess therein, adjustable meansassociated with the tripping weight to oppose movement of the latter toa tripping position until a predetermined speed of the rotary member isattained, a

supplemental weight member within :the longitudinal recess, inwardlyprojecting pins or lugs carried bythe tripping mem attained, adetachable ber, slots or recesses on the supplemental weight member, thesupplemental weight memberbeing adapted to be placed into position bypassing the slots thereof over the lugs :01 pins :and turning it so thatthe recesses thereof may .be seated on the lugs or pins, and meansforhol'd-ing the supplemental Weight member .ivith the recesses seatedon the lugs or pins.

9. The combination with a rotary member having a diametral --openi ng' atripping member inithe opening and having a recess at the end oppositeto the tripping end, a

supplemental weight member in the recess, abutment means extendinginwardly of said recess, said supplemental weight member being recessedso as to vpassover said abutment means by longitudinal movement thereofwith respect to Jthetripping memvber and-to be turned so that one faceof the supplemental Weight anember rests against said abutment means,and means cooperating with the-tripping member and With the supplementalweight member for confining the latter with respect I to the abutmentmeans.

10. In an auto-stopgoverning mechanism for a rotary device, thecombination of a tripping member movable transversely of the axis ofrotation and having a longitudinal ireoess, one, :or more abutments-iextending inwardly "from the sides ofthe recess adjacent tothe :open end thereof, a supplemental weight member having a recess orrecesses to pass over the abutment or abutinents, and elastic means in:the recess for holding the supplemental weight member againsttheabutment or abutments after said Weight anember is turned :to' move therecess or recesses out not registry with the vabiuiment or abutments.

11. The combination with a rotary anem- :ber having a transverseopening, a tripping member in the openingand having alongiitudinally-extending cylindrical recess, in-

wardlysextendin g lug or lugs on the interior of said recess, asupplemental weight member which fits the recess and which is recessedto pass over the lug or lugs, and a spring Within the recess to hold thesupplemental wveight member in contact with the lug or lugs.

12. ulheicombination with a rotary, member having a transverse opening,a tripping s member in the opening and having a ongitudinally-extending-.cylindrie,al RIZBCQSS, inwardlyentending lug "or lugsaon the interioroi :said'recess, a supplemental Weight member which fits the recess andwhich is recessed to pass over the lug- ;or lugs, "and means cooperatingwith the itmpping unember and lwlththe supplemental Weight meln- :bertor confining the latter in position with recessed to pass over the lugor lugs, said supplemental we ght memberhaving a toolreceiwing portionin its exposed end, and

means cooperating with :thejtripping mem- :ber and with saidsupplemental weight member for eonfining the latter in positionmithrespeot to said Jug or lugs.

In testimony whereof, we have hereunto SllbSOl'lbGd our names this 4thday of .June, 1920.

Jenn r. messy.

WILLIAM a. MANNING.

